flushing tlb in try_to_swap_out

["Raghu R. Arur" <rra2002@aria.ncl.cs.columbia.edu>]

   I see that in try_to_swap_out() (linux 2.4.19), the page that is being
unmapped from a process is flushed out. But try_to_swap_out() is executed
in the context of kswapd. And also whenever a context switch takes place
the whole tlb is flushed out. So is this flushing done just becuase linux
uses lazy_tlb_flush during process context switch ?

 thanks a lot,
 Raghu
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